Classifications

• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/02—Inorganic compounds ; Elemental compounds
  • C11D3/12—Water-insoluble compounds
  • C11D3/1233—Carbonates, e.g. calcite or dolomite
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D11/00—Inks
  • C09D11/02—Printing inks
  • C09D11/14—Printing inks based on carbohydrates
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/02—Inorganic compounds ; Elemental compounds
  • C11D3/04—Water-soluble compounds
  • C11D3/10—Carbonates ; Bicarbonates

Definitions

• the invention relates to detergent compositions, and in particular to detergent compositions adapted for fabric washing.
• Detergent compositions commonly incorporate as major ingredients detergent active compounds together with detergency builders.
• Conventional detergency builders are commonly inorganic materials, particularly the condensed phosphates, for example sodium tripolyphosphate. It has, however, been suggested that the use of phosphate detergency builders can contribute to eutrophication problems.
• Alternative detergency builders which have been proposed, for example sodium nitrilotriacetate (NTA) and synthetic polyelectrolyte materials, tend to be more expensive or less efficient than the phosphate detergency builders, or otherwise unsatisfactory for one reason or another.
• sodium carbonate can function as a detergency builder by removing the calcium from hard water in the form of precipitated calcium carbonate. But the calcium carbonate tends to accumulate on washed fabrics, which can lead to fabric harshness, and on washing machine surfaces.
• detergent compositions containing an alkali metal carbonate detergency builder are improved by incorporating therein calcium carbonate in a finely divided form.
• the new compositions tend to form less inorganic deposits on washed fabrics, and hence give decreased fabric harshness, apparently because the precipitated calcium carbonate is deposited on the added calcium carbonate instead of on the fabrics or washing machines.
• the detergency of the compositions is improved, compared with those detergent compositions in which inorganic deposition on the fabrics is decreased by inhibition of the precipitation process, either by the addition of anti-deposition agents or by the actions of precipitation inhibitors which we have found to be present in wash liquors.
• the added calcium carbonate also appears to act as a scavenger for the calcium carbonate precipitation inhibitors, which facilitates the nucleation process and increases the effect of its presence.
• the detergent compositions may include a crystallisation aid as defined hereinafter.
• the presence of the crystallisation aids appears to encourage the precipitation of calcium carbonate from solution and tends to improve detergency.
• the alkali metal carbonate used is preferably sodium or potassium carbonate or a mixture thereof, for reasons of cost and efficiency.
• the carbonate salt is preferably fully neutralised, but it may be partially neutralised, for example a sesquicarbonate may be used in partial replacement of the normal carbonate salt; the partial salts tend to be less alkaline and therefore less efficient.
• the amount of the alkali metal carbonate in the detergent composition can be varied widely, but the amount should be at least about 10% by weight, preferably from about 20 to 60% by weight, though an amount of up to about 75% could possibly be used if desired in special products.
• the amount of the alkali metal carbonate is determined on an anhydrous basis, though the salts may be hydrated either before or when incorporated into the detergent composition.
• the calcium carbonate used should be finely divided, and should have a surface area of at least about 5 square meters per gram (m 2 /g), generally at least about 10 m 2 /g, and preferably at least about 20 m 2 /g.
• the particularly preferred calcium carbonate has a surface area of from about 30-100 m 2 /g.
• Calcium carbonate with surface areas in excess of about 100 m 2 /g may be used, up to say 150 m 2 /g, if such materials are economically available, but it appears to be unlikely that any higher surface areas will be achievable commercially and this may in any case be undesirable for other reasons, for example especially small particles, i.e., with very high surface areas, may have a tendency to be deposited onto fabrics during the washing process and there may be dust problems.
• the calcium carbonate may be adsorbed onto a substrate, in which case it may not be possible to measure accurately the surface area of the calcite alone.
• the effective surface area can then be deduced by checking the effectiveness of the calcium carbonate and relating this to the effectiveness of calcium carbonates of known surface areas.
• calcite with a surface area of about 50 m 2 /g has an average particle size (diameter) of about 250 Angstrom (A), whilst if the particle size is decreased to about 150 A the surface area increases to about 80 m 2 /g. It is desirable that the particle size of the calcium carbonate should be fairly uniform, and in particular that there should be no appreciable quantity of large particles which could easily get trapped in the fabrics being washed or cause abrasive damage to washing machine parts.
• Any crystalline form of calcium carbonate may be used or a mixture thereof, but calcite is preferred as aragonite and vaterite appear to be more difficult to prepare with high surface areas, and it appears that calcite is a little less soluble than aragonite or vaterite at most usual wash temperatures. When any aragonite or vaterite are used it is generally in admixture with calcite.
• Calcium carbonate can be prepared conveniently by precipitation processes, for example by passing carbon dioxide into a suspension of calcium hydroxide, in which case it may be convenient to use the resultant aqueous slurry of calcium carbonate when preparing the detergent composition, as the drying process may tend to encourage aggregation of the calcium carbonate particles which decreases their efficiency.
• Finely divided calcium carbonate may also be prepared by grinding minerals such as limestone or chalk, but this is not preferred as it is difficult to obtain a high-enough surface area. Suitable forms of calcium carbonate, especially calcite, are commercially available.
• the calcium carbonate is preferably in substantially pure form, but this is not essential and the calcium carbonate used may contain minor amounts of other cations with or without other anions or water molecules.
• the amount of calcium carbonate used in the compositions should be from about 5% and preferably at least about 10 up to about 60%, more preferably from about 20 to about 50%, by weight, particularly from about 25 to 40% by weight of the detergent compositions.
• the lower levels of calcium carbonate may be satisfactory under certain conditions of use when the calcium carbonate is particularly effective or when a crystallisation aid is also present in the composition.
• the surface area of the calcium carbonate very markedly affects its properties, with high surface area materials being more effective, so that lower levels or such materials can be used in comparison with calcium carbonate of low surface area.
• the calcium carbonate could, of course, be added directly to the wash liquor, instead of being included with all the other ingredients in the detergent composition, and the effect is similar provided that the calcium carbonate is added to the wash liquor soon after the other ingredients.
• the amount of calcium carbonate could be higher in relation to the total amount of the detergent composition, but the benefit due to the presence of the calcium carbonate does not appear to increase proportionately above the amounts indicated above.
• the calcium carbonate and other detergent ingredients should of course be dispersed thoroughly in the wash liquor before adding the articles to be washed.
• the crystallisation aids which can be used in the compositions are, as already mentioned, materials which appear to encourage the precipitation of calcium carbonate.
• the main benefit of adding the crystallisation aids is in facilitating the use of lower levels of calcite than would otherwise be necessary to give satisfactory detergency.
• the method for determining whether or not a material is an effective crystallisation aid involves measuring the calcium ion concentration in aqueous solution, after the precipitation of calcium carbonate under standard conditions in the presence of the material. This is because the presence of crystallisation aids gives lower calcium ion concentrations that are otherwise found, possibly because of the influence of the crystallisation aid on the form of calcium carbonate precipitate, as some crystalline forms appear to have different solubilities, depending on the conditions met. It should be mentioned that the effect of crystallisation aids appears to be less marked at higher temperatures and under conditions of vigorous agitation as met in many domestic washing machines.
• the test procedure for determining whether or not a material is a crystallisation aid is as follows:
• An aqueous solution is prepared containing 0.045% by weight of sodium carbonate, 0.05% by weight of calcite (Calofort U50 supplied by J. and E. Sturge Limited, of Birmingham, England) having a nominal surface area of about 50 m 2 /g, and 0.005% by weight of the material under test, together with two parts per million of sodium tripolyphosphate (STP) in water containing 12° (French) Ca hardness at pH 10.2, by admixture of stock solutions.
• STP sodium tripolyphosphate
• STP sodium tripolyphosphate
• a Corning calcium ion electrode is then immersed in this solution at 25°C.
• This electrode responds to calcium ion activity in solution, and develops an electrical potential across the liquid interface of a water-insoluble organic ion-exchange liquid and an aqueous test solution.
• the liquid is a calcium salt of an organic phosphoric acid which exhibits very high specificity for calcium ions.
• the electrode is used in conjunction with a calomel reference electrode, and the differential potential generated is determined and related to those of standard solutions to find the free calcium ion concentration in the solution under test.
• the calcium ion concentration after two minutes is about 1.25 ⁇ 10 - 4 , and after about 12 minutes the calcium ion concentration falls to about 6 ⁇ 10 - 5 .
• the calcium ion concentration is desirably not more than about 1 ⁇ 10 - 4 after two minutes, and not more than about 4 ⁇ 10 - 5 after 12 minutes.
• the calcium ion concentration can be less than about 4 ⁇ 10 - 5 after two minutes, and as little as about 1 ⁇ 10 - 5 after 12 minutes. With such low calcium ion concentrations in wash solutions it is possible to get good detergency figures.
• the amount of the crystallisation aids used in practical detergent compositions can vary from about 0.5 to 20% by weight, depending on cost and performance considerations.
• the amount of the crystallisation aid is preferably at least about 10% by weight of the amount of calcium carbonate present in the compositions.
• any optional crystallisation aid as described above, it is necessary to include in the detergent compositions of the present invention an amount of a nonionic, anionic, cationic, amphoteric or zwitterionic detergent active compound, or a mixture thereof. It is necessary that the detergent active compound or compounds used should not form during use at normal product concentration in hard water excessively water-insoluble calcium salts; this ensures that the detergent active compound is not completely precipitated as its calcium salt instead of calcium carbonate being precipitated.
• the detergent active compound should not be wholly soap, which if added with the sodium carbonate and calcium carbonate would tend to be precipitated too rapidly in the form of its calcium soap, and calcium tallow soap is so insoluble that it does not revert subsequently to the sodium soap, because the calcium soap is less soluble than the calcium carbonate (as measured by the free Ca + + concentration).
• a little soap may be present with other detergent active compounds, as for example in binary or ternary active low sudsing products, where the presence of the soap influences the lather properties, though it does not act as a detergent active compound after precipitation as the calcium soap.
• detergent active compounds which can be used include non-ionic detergent active compounds which are not calcium sensitive, and anionic detergent active compounds which either form water-soluble calcium salts, as for example with certain alkyl ether sulphates, or which tend to form only slightly insoluble calcium salts when used alone but which are used in conjunction with other solubilising compounds, especially other detergent active compounds, for example mixtures of certain alkyl benzene sulphonates with nonionic detergent active compounds, and some mixed olefin sulphonates of which some of the olefin sulphonate constituents appear to act as solubilising agents for the other less-soluble constituents.
• nonionic detergent active compounds which can be used in the compositions of the invention include ethoxylated fatty alcohols, preferably linear primary or secondary monohydric alcohols with C 10 -C 18 , preferably C 10 -C 15 , alkyl groups and about 5-15, preferably 7-12, ethylene oxide (EO) units per molecule, and ethoxylated alkylphenols with C 8 -C 16 alkyl groups, preferably C 8 -C 9 alkyl groups, and from about 4-12 EO units per molecule.
• ethoxylated fatty alcohols preferably linear primary or secondary monohydric alcohols with C 10 -C 18 , preferably C 10 -C 15 , alkyl groups and about 5-15, preferably 7-12, ethylene oxide (EO) units per molecule
• EO ethylene oxide
• nonionic compounds are often used in admixture with minor amounts of other detergent active compounds, especially anionic compounds, to modify the lather characteristics and powder properties; it may also be noted that low levels (about 1-10%) of sodium tallow soap or other long-chain (at least C 16 ) anionic compounds which do form insoluble calcium salts have been found in particular to be beneficial with nonionic detergent active compounds, as they tend to decrease calcium carbonate deposition onto cotton fabrics, and also give some fabric softening effect, whereas with nonionic compounds alone there can be higher deposition than desirable with some fabric harshening. Mixtures of nonionic compounds with amine oxides can also give good results. It should be mentioned that some nonionic compounds are also effective crystallisation aids, but such compounds tend to have poor detergent properties and lather depressant characteristics.
• the preferred anionic detergent active compounds which form either soluble or only slightly insoluble calcium salts, are alkyl (C 10 -C 18 , preferably about C 14 ) sulphates and alkyl (C 10 -C 18 ) ether (1-10 EO) sulphates, particularly those with C 10 -C 15 alkyl groups and 1-7 EO and tallow alcohol 1-5 EO sulphates, and olefin sulphonate detergent active compounds, which latter term is herein used to mean the mixture of anionic detergent active compounds obtained when the products of the sulphonation of olefins are neutralised and hydrolysed.
• the initial reaction product may be reacted with a lower alcohol before neutralisation to form a proportion of an alkoxy alkane sulphonate in admixture with the residue of the olefin sulphonate product.
• the olefins used are preferably linear C 12 -C 20 alpha-olefins, particularly C 14 -C 16 alpha-olefins, produced for example by the "cracked wax” process or by the "Zeigler” process, but localised internal, random or so-called vinnylidene olefins may alternatively be used.
• the anionic detergent active compounds are used in the form of the alkali metal, ammonium or substituted ammonium salts, preferably the sodium salts.
• detergent active compounds which do not form insoluble calcium salts, but which are of less commercial interest, include salts of esters of alpha-sulphonated (C 10 -C 20 ) fatty acids with C 1 -C 10 alcohols, preferably C 1 -C 3 alcohols; salts of 2-acyloxy-alkane-1-sulphonic acids, particularly wherein the alkyl group contains from about 10-22, preferably 12-16 carbon atoms, and the ester forming group contains from 1-8 carbon atoms; trialkyl amine oxides having a C 10 -C 22 alkyl group, and two C 1 -C 4 alkyl or C 2 -C 3 hydroxyalkyl groups; and dialkyl sulphoxides having a C 10 -C 22 alkyl group and a C 1 -C 4 alkyl or C 2 -C 3 hydroxyalkyl group, together with detergent active betaines and sulphobetaines, for example lauryl dimethyl ammonio propane sulphonate.
• mixtures of some detergent active compounds can give particularly good results.
• some alkyl benzene sulphonates (which when used alone tend to form slightly insoluble calcium salts) can be used with minor amounts of certain solubilising compounds, such as nonionic, alkyl sulphate or alkyl ether sulphate detergent active compounds, to give good detergent properties and be relatively economical.
• the ratio by weight of such solubilising compounds to the alkyl benzene sulphonate is preferably from about 1:1 to 1:10, especially about 1:2 to 1:8.
• linear secondary (C 11 -C 15 ) alkyl benzene sulphonates do have very good detergencies in this system and can be used alone, preferably in higher amounts which compensate for any tendency for initial precipitation of some of the detergent active compound, or with calcium carbonates of higher surface area which are more effective at lowering calcium ion concentration quickly.
• These alkyl benzene sulphonates also tend to be effective in lowering slurry viscosity whereas some others have the opposite effect. It may be noted that alkali metal tetra- and pentapropylene benzene sulphonates form more highly insoluble calcium salts and are therefore less satisfactory in this respect.
• the effective amount of the detergent active compound or compounds used in the compositions of the present invention is generally in the range of from about 5 to 40% by weight, preferably from about 10 to about 25% by weight of the composition. It may be noted that the choice of the detergent active compound or compounds used and their amounts appear to influence the precipitation of calcium carbonate, and hence can have a very marked affect both on detergency and on fabric deposition. For example, whilst alkyl benzene sulphonates appear under some circumstances to encourage the precipitation of calcium carbonate in the form of vaterite, most other detergent active compounds, for example alkyl and alkyl ether sulphates, non-ionic compounds and amine oxides, appear to encourage the formation of some calcite.
• the type of detergent active compounds used therefore influences the optimum level and type of added calcium carbonate, but in general it is best to use calcite of highest surface area, commensurate with cost considerations, at the minimum level to give satisfactory detergency and adequate inorganic deposition control, bearing in mind the necessity to leave sufficient "room” in the detergent compositions for other essential and optional ingredients. Excessively high levels of calcium carbonate are also undesirable as it can sometimes contribute to inorganic deposition under adverse washing conditions.
• detergency builders In addition to the essential alkali metal carbonate and the calcium carbonate it is possible to include minor amounts of other detergency builders, provided that the total amount of the detergency builders does not exceed about 85% by weight, so as to leave room in the detergent compositions for other essential ingredients.
• One such detergency building ingredient is an alkali metal silicate, particularly sodium neutral, alkaline, meta- or orthosilicate.
• a low level of silicate for example about 5-10% by weight, is usually advantageous in decreasing the corrosion of metal parts in fabric washing machines, and it may give processing benefits.
• the amount of silicate can also be used to some extent to control the pH of the composition, which is generally within the range of about 9-11, preferably 10-11 for an aqueous solution of the composition at the recommended concentration. It should be noted that a higher pH (i.e. over about pH 10.5) tends to be more efficient as regards detergency, but it may be less desirable for domestic safety.
• Sodium silicate is commonly supplied in concentrated aqueous solution, but the amounts are calculated on an anhydrous basis.
• detergency builders can be present in minor amounts if desired, for example other so-called precipitant builders which form insoluble calcium salts, such as the sodium salts of long-chain alpha-sulphonated monocarboxylic acids, and alkali metal salts of alkyl and alkenyl succinic and malonic acids, and analogous compounds, some of which can have a desirable fabric softening effect, or some sequestrant builders, especially weak sequestrant builders such as sodium citrate.
• precipitant builders which form insoluble calcium salts, such as the sodium salts of long-chain alpha-sulphonated monocarboxylic acids, and alkali metal salts of alkyl and alkenyl succinic and malonic acids, and analogous compounds, some of which can have a desirable fabric softening effect, or some sequestrant builders, especially weak sequestrant builders such as sodium citrate.
• detergency builders especially certain strong sequestrants such as sodium polyacrylate and other polymeric polycarboxylate builders, and certain organic precipitant builders such as sodium ⁇ -sulpho tallow fatty acids, can have a marked detrimental effect on calcium carbonate precipitation; in the case of the latter organic precipitant builders which are also softening agents, it may be noted that they can be added in calcium salt form where they do not inhibit calcium carbonate precipitation and still retain softening properties.
• sodium tripolyphosphate is a particularly strong calcium carbonate precipitation inhibitor, and it is desirable to exclude its presence from the compositions of the invention, quite apart from eutrophication considerations. In practice, due to plant contamination, its presence at low levels of, say, up to about 0.5% by weight may be unavoidable in the detergent compositions; and in wash liquors additional phosphate may be introduced from clothes previously washed in phosphate-built detergent products.
• a detergent composition of the invention can contain any of the conventional additives in the amounts in which such additives are normally employed in fabric washing detergent compositions.
• these additives include lather boosters such as alkanolamides, particularly the monoethanolamides derived from palm kernel fatty acids and coconut fatty acids, lather depressants, anti-redeposition agents, such as sodium carboxymethylcellulose, oxygen-releasing bleaching agents such as sodium perborate and sodium percarbonate, peracid bleach precursors, chlorine-releasing bleaching agents such as trichloroisocyanuric acid and alkali metal salts of dichloroisocyanuric acid, fabric softening agents, inorganic salts such as sodium sulphate, and, usually present in very minor amounts, fluorescent agents, perfumes, enzymes such as proteases and amylases, germicides and colourants.
• lather boosters such as alkanolamides, particularly the monoethanolamides derived from palm kernel fatty acids and coconut fatty acids
• lather depressants
• the detergent compositions of the invention may take any of the common physical forms associated with fabric washing detergent compositions, such as powders, granules, cakes and liquids. They may also be produced by any of the techniques commonly employed in the manufacture of fabric washing detergent compositions, including particularly slurry-making and spray drying processes, for the manufacture of detergent powders. However, the fine powder form of the calcium carbonate when dry may necessitate steps to control dustiness.
• Three detergent compositions including a comparative product A were made by admixture of the ingredients and the compositions were used to wash a variety of domestically-soiled halved articles, and the washed articles were then compared for appearance against the halved articles washed in a comparative commercially available conventional sodium tripolyphosphate-built detergent composition.
• the wash solutions contained the levels of ingredients shown below, with the free calcium hardness levels measured in the wash liquors (total product concentration 0.2%).
• Example 1 The washing machine tests were conducted using RCA Whirlpool machines with 6° Ca + + hardness water at 50°C.
• the results of the examination of the halved articles showed a significant preference overall for the composition of Example 2 over both the compositions of Example 1 and over the comparative sodium tripolyphosphate-built composition.
• the composition of Example 1 was still significantly preferred to the comparative composition, though well behind Example 2, but on cotton towels and nylon socks the composition of Example 1 was slightly inferior to the comparative composition.
• Product A gave worse results than either of Examples 1 and 2 or the comparative sodium tripolyphosphate-built composition.
• compositions were prepared for determining the extent of inorganic deposition on the internal surfaces of a domestic washing machine, but only one of the compositions included calcite in accordance with the present invention.
• the compositions were used in a Whirlpool washing machine run on its normal washing cycle using water of 12° Ca 2 + hardness and 4° Mg 2 + hardness at 50°C, giving wash solutions containing the following levels of ingredients (product concentration 0.2%):Ingredients % in wash solution Example 3
• Example 3 there was only a very slight deposition of calcium carbonate whereas with the comparative product B there were heavy incrusted deposits of calcium carbonate which would cause severe maintenance problems in domestic use.
• the addition of 5% of Polyfon H to Example 3 was found to give even lower calcium carbonate deposition.
• Three detergent compositions including a comparative product C were prepared by admixture of the ingredients and tested as described for Example 3.
• the wash solutions contained the following levels of ingredients (product concentration 0.2%):
• compositions including a comparative product D were prepared by admixture of the following ingredients:
• a detergent composition was prepared to the formulation of Example 7 except that the detergent active compound used was Tergitol 15-S-9. This composition was then evaluated for inorganic deposition on fabric by washing a single piece of cotton terry towelling alone in a Whirlpool washing machine using 12°H Ca + + water at 50°C and a product concentration of 0.2%. Under these particularly severe conditions an inorganic deposit of 7.6% built up on the fabric after 20 wash cycles, whereas for a comparative product not containing the calcite the inorganic deposit was as high as 19.5% after 20 wash cycles.
• a 7lb load of domestically-soiled articles was washed with these compositions in a Whirlpool washing machine using water of 12°H Ca + + and 4°H Mg + + at 50°C and a 0.2% product concentration, the soiled articles being added to the wash liquor immediately before the compositions were added in each case, instead of the usual recommended procedure wherein the soiled articles are added to the wash liquor after the detergent composition has been added and well dispersed therein.
• the levels of inorganic deposits on cotton terry towelling using Example 9 was 0.75 and 1.19% respectively, whereas for product E the inorganic deposition was 5.89 and 20.35% respectively, under these severe washing conditions.
• Example 9 and product E were further tested for inorganic deposition as described above except that the water used contained 12°H Ca + + only (i.e. no Mg hardness).
• the inorganic deposition results on cotton terry towelling and polyester/cotton sheeting were as follows:
• Example 9 and product E were also compared for detergency against a commercially available conventional sodium tripolyphosphate-built detergent powder F.
• This test was a 3-way comparison of washing halved, domestically-soiled articles in a Whirlpool washing machine using a 0.2% product concentration and various conditions of water hardness and temperature.
• the results showed that with 6°H Ca + + water at 50°C, the articles washed with the composition of Example 9 were significantly preferred to those of the comparative product F, which was in turn preferred over product E.
• With 12°H Ca + + water, at 50°C the same order of preference was obtained; but on lowering the temperature to 40°C, the comparative product F was preferred to Example 9, with the product E again giving much inferior results.
• compositions were then tested for inorganic deposition on cotton terry towelling using the procedure of Example 10, with the following results after 3 wash cycles:
• a series of detergent compositions were prepared by admixture of the various ingredients and wash solutions were then prepared with the following concentrations of the ingredients (product concentration 0.15%):
• the wash solutions were used to determine the detergencies of the compositions in a Terg-O-Tometer at 50°C; the water contained 12°(Ca) hardness and the test cloth was artificially soiled with C 14 radio-active labelled sebum.
• vaterite gives some benefit, especially at the higher level, but it is still substantially less effective than the calcite of higher surface area.
• a fully formulated particulate detergent composition was prepared by conventional slurry-making and spray drying techniques to the following formulation:
• Example 19 gave the best detergency though the differences caused by the decreased sodium carbonate content with increased calcite levels in Examples 20 and 21 were marginal.
• compositions were tested for inorganic deposition on cotton terry towelling and detergency as before, with the following results (3 wash cycles):
• the test was done in a Terg-O-Tometer using a product concentration of 0.15% in water of 120 ppm Ca + Mg (2:1) at 120°F.
• the initial and final light reflectances of the clean fabric were measured to give by difference an indication of the soil redeposition after the 5 washes.
• the same procedure was repeated with the addition of 50% of Calofort U50, based on the amount of the detergent composition, to give the following results:
• a series of seven hand dishwashing powders including two comparative products J and K were prepared by admixture of the following ingredients:
• Example 34 had a detergency of 60.3% against a detergency of only 29.9% for the product M. It was confirmed that the soap in product M had not been kept in solution by the detergency builder systems, and was therefore ineffective.
• a series of detergent compositions were prepared to the following formulation:
• Cotton test cloths were then washed in these compositions using 0.15% product concentrations at 50°C in 12°H Ca + + water and the % inorganic deposition was found after 10 repeated wash cycles to be as follows:
• a series of detergent compositions were prepared with varying levels of sodium alkaline silicate as follows:
• the detergencies of each of these products were determined by the Terg-O-Tometer test using a cotton test cloth artificially soiled with a radioactive sebum, at a product concentration of 0.15% in water of 18°H (Ca + +:Mg + + , 2:1) at 50°C.
• the detergencies of a series of similar products not containing any calcite were also determined, with the following results:
• the % detergencies were as follows (using the same test procedure as in Examples 43 to 46 but with a product concentration of 0.3%).
• a series of detergent compositions with different detergent active compounds were prepared to the following formulation:
• a detergent composition was prepared as follows:
• a series of detergent compositions were prepared with various levels of ingredients as follows:
• the detergencies were determined by the procedure of Examples 43 to 46 at 0.15% product concentration, together with the detergencies of comparative products without calcite, as follows:
• a liquid detergent composition has the following formulation:
• the composition has an adequate detergency, especially when used at high product concentrations.
• a detergent composition was prepared with the following formulation:
• a low sudsing product was made to the following formulation:
• the detergency test (halved articles) showed general equivalence with a commercially available high STP detergent powder (1 preference for Example 71, 3 preferences for the comparative STP product and 14 no differences).
• compositions were tested for the levels of precipitated inorganic deposition (i.e. excluding deposited Calofort U50) in terg-o-tometer tests using a product concentration of 0.15% in 12°H (Ca + + ) water radio-active labelled with Ca 45 , at 50°C.
• the levels of calcite used were as follows, with the detergent active compound being either anionic (sodium sec-linear alkyl (C 11 -C 15 ) benzene sulphonate) or nonionic (Tergitol 15-S-9), or for comparative purposes with no detergent active compound, to give the levels of deposition shown:

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• 1973
  • 1973-01-23 GB GB332173*[A patent/GB1437950A/en not_active Expired
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  • 1973-08-22 DE DE2342461A patent/DE2342461C3/de not_active Expired
  • 1973-08-22 NL NLAANVRAGE7311595,A patent/NL180443C/xx not_active IP Right Cessation
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